Shear pin for crushing machines



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SHEAR PIN FOR CRUSHING MACHINES Filed Dec. 6,` 1930 March 14, 1933.

Patented 14, 1533 UNITED sr-Arss PATENT' orales muur w. camion nos nemcnnrgonnm ruf non causante n Application mea recenter e, raso. semi no.scam.

My invention relates generally to yielding jaw crushing machines of thetype disosed in m co-pendin application for U. S. Letters atent fileday26, 1930, Serial No. 455,793 and the principal object of my inventionis, to provide ina crushing machine of the type referred to a shear pinthat functions as a factor of safety in the event that the crushingmachine is subjected to danger of injury or breakage in the event that apiece of metal or other uncrushable material accidentally enters thespace be-l tween the crushing jaws.

Further ob'ects of my invention are, to rovide simple and etlicientmeans for' efecting the shearing of a in at predetermined points in theevent t at an uncrushable object passes into the machine between thecrushing jaws thereof, further, to ar- 90 range on the shear pin atoggle thrust sleeve that serves as a bearing for the toggle link. orlinlrsthat engage the pivoted or swinging jaw of the machine, further,to rovide means whereby the thrust Sleeve 1s adjustably mounted on theshear pin in order that new bearingmsurfaces may be presented to thetoggle ks in the event of wear by the said links and the surface of thethrust sleeve and `further, to provide simple and eicient means forsupporting the thrust sleeve and holding the same against rotation whileserving as a thrust bearing for the toggle links.

v A further object of my invention is, to provide saddles for thesupport of thetoggle thrust sleeve on the frame of the crushing machineand which saddles are mounted so that they will by gravity,slide out ofthe frame of the machine in the event that the shear in is sheared as aresult of an un- 4' crusha le object entering the machine whilev thesame is in o ration. A further o ject of my invention is,` to provide asafety factor 1n the form of-a shear in for crushing machines that willeffectu yV prevent distortion and breakage of the frame of the machinein the event that thecru `shing jaws encounter an uncrushable obct.' v1th the foregoing 'and other objects in view, my inventlon in certainnovel features of construction and arrangement of parts that willhereinafter he more fully described and clarmed and illuhstr'lated'inthe accompanying awing 1n w c Fig. 1 is a vertical section taken throughthe center of a yielding jaw rock crushing machine and showinv the sameequipped with a shear pin in accor ance with my mvention.

Fi 2 is an enlargedJ crosssection taken on the line 2-2 of Fig. 1. i i

Fig. 3 is an' enlarged cross section of the shear pin and showing theend of the toggle link that engages' the end of the thrust sleeve onsaid pin. Y Referring by numerals to the accompanyingy drawing, whichillustrates a practical embodiment of my invention, 10 designates theframe of a yielding jaw rock crushing machine, 1l the hopper-throughwhich the material to be crus ed is fed into the machine, 12 thecrushing jaw that is yieldingly resisted by spring cushion 13 and 14:,the

swinging jaw that .is actuated by means of an eccentrlc 15. l

Bearing against the upper rear portion of body 14 is the inner end of atoggle link 16.,

Formed in the rear wall of the frame of, the machine directly below thespring assembly that supports the upper portion of a jaw 14, is anopening 1'( and projecting inward- 80 1y and upwardly from the lowerportion of this opening is an inclined plate 18 that forms a part of thecrusher frame.

Arranged for sliding movement on this plate 18, are saddles 19 thatsupport a toggle thrust sleeve 2O and the latter encloses theintermediate portion of a shear piu 21.

This shear pin is preferably formed of mild steel and thrust sleeve 2Ois formed of aively hard metal, preferably treated f The ends of thrustsleeve 20 terminate immediatel adjacent to the inner faces of the side ws 10 of the main frame 10 and seated in -said side walls are shear pinbushof hardened metal that receive the en portions of the shear pinandthe inner ends ofthese bushings. abut the ends of the to lethrusts1eeve20. f

f e ends of shear pin 21Y project slightly 10 Y 'projecting ends arethreaded on the sur 22 and said r the reception of nuts 23 and whichlatter, when tightened, bear directly against the outer ends of thethrust bushings.

Seated in and projecting from thrust sleeve beyond' the ends of thebushings O 20, adjacent to the side walls 10 are radially' disposed pins24, certain of which pins pro ject into'recesses that are formed in theouter end of toggle/link 16 and other pins project downwardly intorecesses that are formed in the saddle blocks 19.

The pins that project into the toggle link 16 function asphinge pins atthe same time they retain the outer lower end of the toggle inl positionagainst the periphery `of the thrust sleeve and those pins that projectinto the saddles 19, hold the toggle thrust sleeve against rotarymovement.

As described, there are two sets of these pins 24 and each set com risesa lurality of pins, the same being r ially disposed and preferablyspaced e ual distances a art. This arrangement ena les the thrust s eevetobe rotated ashort distance so as to 'present a new bearing surface forthe lower end of the toggle when one surface has become worn to anundesirable degree. v

Obviously to make this. adjustment of the thrust sleeve, it is necessaryto remove one' of the nuts 13 and withdraw the shear pin and then rotatethe thrust sleeve in one ydirec- 'tion or the other so as to bring a newbearing surface into position to engage the outer lower end of thetoggle.

The end of the toggle that bears against the thrust sleeve is concaveand its radius is slightly'greater than the radiusof the sleeve and, asa result of this construction, the tofrgle link while in operation,rolls Face of the thrust sleeve without sliding movement and-thereforeno lubrication at this bearing is required.

In the event'that an uncrushable piece of material or a foreign objectsuch as a dipper tooth enters the machine and passesV downwardly betweenthe jaws thereof, and which action would ordinarily damage the crusher`to a considerable extent throu h breakage of parts anddistortion of theframe, the developmentof abnormal crushing strains produced as a resultofthe en agement of the jaws with the uncrushable o ject, will sheer thepin 21 on lines in the planes occupied by the abuttin .ends of sleeve 20and the bushings 22. en such shearin place, the weight of the severeintermediate portion of the shear pin and the thrust sleeve, will causevthe saddles 19 to slide by gravity, `downward over `the inclined plate18 and these parts will dischar e through openings 17 in the wall of therame.

`This shearing action of the pin 21 at predeterminedpoint's, iseffective in preventing distortion of the frame in which the pin isaction takesv `sheared it is a comparatively easy matter to install anew pin. y

It will be understood that the abuttingends of the, sleeve 20 and the`bushings 22 provide shearing elements that act under abnormal pressureto shear the pin 21 at points just inside the side walls of the machineframe and thus said frame is in no wise damaged by breakage ordistortion. j

Thus it will be seen that I have provided a shear pin for yieldin jawrock crushing machines that is relatively simple in construction,inexpensive of manufacture,capa ble of being rea'dil installed for useand very effective in per orming the functions for whlch it is intended.

It will be understood that-minor changes i'n the size, form andconstruction of the various parts of my improved yielding jaw rockcrushing machine may be made and substituted for those herein shown anddescribed without departing from the spirit of my invention, the scopeof which is set forth in the appended claims.

' I claim as my inventiom' k 1. In a yieldlng jaw rock crushing machine,bushings seated inlthe side walls of the machine, a shear' pin havingits end portions seated in said bushings and a tog le thrust sleevearranged on said shear pin etween said bushings, the ends ofgwhichsleeve and the inner faces of which bushings constitute shearingelements for cutting lthe shear pin in the event of abnormal pressuresthereupon.

2. In a yielding jaw rock crushing machine, bushings seated in the sidewalls of the/machine, a shearpin having its end `por.- tions seated insaid bushings, a toggle thrust sleeve arranged on said s ear pm betweensaid bushings and saddle blocks arranged for sliding movement on theframe of the ma- .chine and suppirting said thrust sleeve.

3. In a y1e ing jaw rock crushing machine, bushings seated inthe sidewalls of the machine, a shear pin having its end portions seated in saidbushings, a toggle thrust sleeve arranged on said shear pin between.

said bushings the ends of which sleeve and the inner faces of whichbushings constitute cooperating shearing elements for cuttingcooperating shearing. elements for putting..

sures thereupon, a toggle link bearing on said ythe shear p1n in theeventofl'abnormal pres-f4 j thrust sleeve and hinge pins pro'ectin fromsaid thrust sleeve into said togg 5. In` a yielding jaw rock chine,bushings seated in the side w of the frame of the machine, a shear pinhaving its ends seated in said bushings, a thrust sleeve arranged onsaid shear pln between said bushings, a, toggle link bearing on 'saidthrust sleeve, hinge pins projectingv .from said thrust sleeve mto saidtoggle link and the radius of the'end of the toggle link that bears onsaid thrust sleeve being greater than the radius of said. sleeve. j

6. In a yielding jaw'rock crushing ma- 15 chine, bushings located in theside walls of the machine, a shear pin havin its ends seated in saidbushin s, a thrust s eeve mounted on-'said shear pin tween saidbushings, saddle blocks mounted for sliding movement on the frane of themachine below said thrust sleeve and ins rejecting from'said sleeve intosaid sa dle locks. f

7. In a` ielding jaw rock` crushing machine, bushings seated in the sidewalls o f the frame of the machine, a shear pin having its ends seatedin said bushin s, a toggle thrust sleeve arranged onsaid s ear 1nbetween said bushings anda lurality o pins seated in'and proyecting raially from said thrust sleevi' 1am i k I 8. na ie jawroc cr machine,bushi'ngs seagted in the' side walls of the frame `of the machine, ashear pin having its ends seated in said bushin s, a toggle thrustsleeve arranged on s aid s earfpm between said bushings, a plurality of'pins seated in and projecting radially from said thrust sleeve, a.toggle bearing on said thrust sleeve and engaged by certain of saidpins and 40 saddle blocks arranged for sliding movement on the frame ofthe machine below said thrust sleeve and engaged by certain of the pinscarried thereby.

9. In a yielding jaw rock crushing machine, bushings seated in the wallsof the machme, a shear pin having its ends extended through saidbushings and a togle thrust sleeve adjustably mounted on sai shea pinbetween said bushings. .50 10. Ina yielding aw rock crushing ma chine,bushings seate in the walls of .the mai chine, a shear pin having itsends extended through said bushings, a tog le thrustsleeve adjustablmounted on sal shear pm betweensai bushingsandto glelink up;

pins projecting radially rom said thrust eeva. v

In testimony whereof I ax my sliature. ST.

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